P24DE code meaning
Reductant Purge Control Valve B Circuit High
Powertrain system Generic code P24xx codes Check engine light
What P24DE means
With P24DE the control line of purge valve B stays at high voltage while the controller is actually pulling it to ground to switch the valve. That points to a short to the battery feed on the wire between valve and controller, or a valve coil with too little resistance, so that the driver protects itself and the valve never shifts. No manufacturer documents P24DE publicly. For valve A, GM runs the equivalent P20A3 check while the driver is switched on (6.6 L Duramax). CARB requires heavy-duty SCR actuators to be checked for this kind of circuit fault. The consequence is the reverse of P24DD: the valve stays in dosing position, so the line is not emptied at shut-down and can freeze. Interruptions are P24DB, the functional test P24DC.
P24DE at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P24DE
- Malfunction indicator lamp on
- DEF line not purged, frozen line after frost
Common causes of P24DE
- Most likelyControl wire touching a supply line
- PossibleValve coil with shorted turns and too low resistance
- Less likelyDamaged driver stage in the control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant purge valve b
What each part of P24DE means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| DE | The exact fault in that area. |
What to do next
- Note P24DE and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P24DE
What does P24DE mean?
P24DE means "Reductant Purge Control Valve B Circuit High". With P24DE the control line of purge valve B stays at high voltage while the controller is actually pulling it to ground to switch the valve. It is a generic code, so it means the same on every make.
Is it safe to drive with P24DE?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P24DE fail an emissions test?
Yes, it can. P24DE is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P24DE to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P24DE clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.